/***
 * Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 * 	http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */

package br.com.caelum.vraptor.converter;

import static com.google.common.base.Strings.isNullOrEmpty;

import java.text.MessageFormat;
import java.util.ResourceBundle;

import br.com.caelum.vraptor.Convert;
import br.com.caelum.vraptor.Converter;
import br.com.caelum.vraptor.ioc.ApplicationScoped;

/**
 * VRaptor's Integer converter.
 *
 * @author Guilherme Silveira
 */
@Convert(Integer.class)
@ApplicationScoped
public class IntegerConverter implements Converter<Integer> {

	public Integer convert(String value, Class<? extends Integer> type, ResourceBundle bundle) {
		if (isNullOrEmpty(value)) {
			return null;
		}
		
		try {
			return Integer.valueOf(value);
		} catch (NumberFormatException e) {
				throw new ConversionError(MessageFormat.format(bundle.getString("is_not_a_valid_integer"), value));
		}
	}

}
